Cast Enigma

This puzzle was originally patented in America in 1975 and designed by Eldon Vaughn. Hanayama have made this new version maintaining the difficulty of the original and licensed it for the Cast Puzzle series. This is without a doubt among the most difficult of all puzzles.
Don't use too much force, the pieces should just slide apart, no really, they do!
Copyright Hanayama-Japan

Difficulty level 6